#375E9B
Closest named color: Denim Blue (#3B5B92). oklch(48.4% 0.108 259), rgb(55, 94, 155).
Aa
White text reads best on this color (6.48:1).
About this color
#375E9B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.108 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.015 away. White text reads best on it, at 6.48:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.23:1 |
| White text | 6.48:1 |
Values
| HEX | #375E9B |
| RGB | rgb(55, 94, 155) |
| HSL | hsl(217, 48%, 41%) |
| OKLCH | oklch(48.4% 0.108 259) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #375E9B | 6.48:1 | AA | Lc -87.1 | Fine for body text |
| Black text on #375E9B | 3.23:1 | AA large text | Lc 22.1 | Dividers and decoration only |
| #375E9B text on white | 6.48:1 | AA | Lc 82.0 | Fine for body text |
| #375E9B text on black | 3.23:1 | AA large text | Lc -19.9 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 700.
-
Step 50
50
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAED
oklch(88.5% 0.029 259.6)
-
Step 300
300
#ADC2E3
oklch(80.9% 0.052 259.4)
-
Step 400
400
#81A2D5
oklch(70.7% 0.084 258.9)
-
Step 500
500
#618ACA
oklch(63.1% 0.107 259)
-
Step 600
600
#4873B7
oklch(55.6% 0.117 259.2)
-
Step 700
700 (this color)
#375E9B
oklch(48.4% 0.108 259)
-
Step 800
800
#304F80
oklch(42.8% 0.09 259.2)
-
Step 900
900
#2A4266
oklch(37.7% 0.069 258.3)
-
Step 950
950
#19273C
oklch(27.1% 0.044 258.3)
#375E9B with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #43639D | 0.021 |
| Deuteranopia (no green cones) | #355A9A | 0.012 |
| Tritanopia (no blue cones) | #006C75 | 0.090 |
| Achromatopsia (no color) | #5E5E5E | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #375E9B
#375E9B
oklch(48.4% 0.108 259)
- #7D5700
#7D5700
oklch(48.5% 0.101 79.2)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #375E9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.015
- Dusky Blue #475F94 ΔE 0.022
- Denim #3B638C ΔE 0.032
- Light Navy Blue #2E5A88 ΔE 0.034
- Peacock Blue #016795 ΔE 0.040
- Dusk Blue #26538D ΔE 0.043
- Twilight #4E518B ΔE 0.046
- Mid Blue #276AB3 ΔE 0.046
Use #375E9B in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.